running electrical in a new bathroom

I am running electrical in a new bathroom. The situation that I have is this- I have to install a fan/light combo in a bathroom using a switch for each. I am having trouble with making the connections at the switch box. What i have done so far is ran 12/3 from service box to the switches with the red and black wires having their own breakers. The red is the light and the black is the fan. I only had 12/2 left so i ran that from the switches to the light. I have connected the white to the white as the neutrals. How do I make my connections at the switches with the red and black? Any help and suggestions would be greatly appreciated.
Thanks
Mark

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running electrical in a new bathroom

You wired it backwards. There is no need for each device to have it's own breaker...and if you did it with 12/3 wiring, it means they are sharing the neutral wire, which if done wrong is dangerous.

What kind of breakers did you use? For two breakers to share a white, they MUST be on opposite hot legs of the panel and they need to be on a double-pole breaker or use handle ties to they turn on and off together.

You should run this using normal 12/2 wire. You would split the black in the switch box with a pigtail to each switch, then use 12/3 to feed power to your fan/light.

Also - this thread is the same question you posted a week ago - try to keep topics to 1 thread to avoid clutter.